<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="handle">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'"  >
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          :collapse="isCollapse"
          :unique-opened="true"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
          background-color="#313541"
          text-color="#fff"
          active-text-color="#409FFF"
        >
      <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id" >
            <!-- 一级菜单模板 -->
            <template slot="title">
              <!-- 图标 前面加:通过属性绑定渲染每一个不同的id,不能固定写死 -->
              <i :class=" iconObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
           <!-- 二级菜单 -->
           <el-menu-item :index="subItem.path + '/'" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState(subItem.path + '/')">
             <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </template>
           </el-menu-item>
          </el-submenu>
          
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      iconObj:{
        // item.id作为键 item.icon作为对应的唯一值
        '125': 'iconfont icon-users',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
  created() {
    this.getMenuList(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    handle() {
      // 清空token
      window.sessionStorage.clear()
      // 通过编程式导航重定向到登录页
      this.$router.push('./login')
    },
    //获取所有的菜单
   async getMenuList() {
    const { data: res } = await this.$http.get('menus')
    if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
    this.menulist = res.data
    console.log(res);
    
    },
    // 点击按钮,切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    saveNavState(activePath) {
      // 保存在sessionStorage中
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath =activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  // 开启伸缩盒子弹性布局
  display: flex;
  // 左右贴边对齐
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #313541;
  .el-menu{
    border-right: none;
  }
  
}
.el-main {
  background-color: #eaedf1;
}
.iconfont{
    margin-right: 15px;
  }
.toggle-button{
  background-color: #313541;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  color: #fff;
  // 字符间距
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>